14N NMR studies on some 1,2,5-oxadiazoles, their sulphur analogues and N-oxides
β Scribed by M. Witanowski; L. Stefaniak; A. Grabowska; G.A. Webb
- Book ID
- 113374048
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- English
- Weight
- 159 KB
- Volume
- 34
- Category
- Article
- ISSN
- 1386-1425
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π SIMILAR VOLUMES
## Abstract High precision ^14^N nuclear screening data are presented for some alkylβ and arylβ__N__βsulphinylamines. For the alkyl compounds the Ξ² effect is seen to produce a decrease in screening and the opposite influence from the Ξ³ effect is also observed. An exception to the general tendency f
4-15N-2,3,5-Trimethylpyrazine (A) was synthesized by dechlorination of 4-15N-6-chloro-2,3,5-trimethylpyrazine (I), the key intermediate, derived from 15N-D~alanine (a). 1-15N-2, 3,5-Trimethylpyrazine (2) was prepared by decarboxylation of 1-15N-2,3,5-trimethyl-pyrazine-6- carboxylic acid (10) obtai